Pumice Life Cycle

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Transcript of Pumice Life Cycle

Pumice rock begins as molten rock or lava, super-heated minerals that flow or shoot out of a volcanoes crater. This molten lava will flow until it cools and forms into pumice, granite or obsidian.Molten Rock After being shot out of a volcano and turning into a rock, the pumice stone will break down and crumble because of the intense heat and pressure. The rock becomes more compact sometimes forming a new type of rock. It compacts on its air pockets and becomes denser and heavier, becoming a different type of rock all together. Breaking Down Once the lave has cooled, it will form rock. This rock cools in different ways; pumice rock contains air pockets in it, giving it a light feel and the ability to float in water. This also means pumice can be broken down easily, because it is less solid than denser igneous rock.Cooling of Pumice During the cooling stage, the pumice still contains gas and air bubbles inside from the lava it used to be. The gas bubbles inside expand and exit the still molten rock making holes all over the rock. Once the rock completely cools and becomes pumice, the holes don't have enough time to cave in, so the rock forms with the holes still on it. Gas ReleasePumice Life CycleRock Changing Overtime